Portion of a shoe sole



FIG. 1 is a bottom plan view of the portion of a shoe sole according to my new design;

FIG. 2 is an elevational view of the left side of the portion of a shoe sole of FIG. 1; and,

FIG. 3 is an elevational view of the right side of the portion of a shoe sole of FIG. 1.

The broken line showing of the remainder of the shoe sole is environmental only and forms no part of the design. 

The ornamental design for a portion of a shoe sole, as shown and described. 